// SPDX-License-Identifier: GPL-2.0-only
/*
* GPIO driver for the ACCES 104-IDI-48 family
* Copyright (C) 2015 William Breathitt Gray
*
* This driver supports the following ACCES devices: 104-IDI-48A,
* 104-IDI-48AC, 104-IDI-48B, and 104-IDI-48BC.
*/
#include <linux/bits.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/gpio/regmap.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/isa.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/regmap.h>
#include <linux/types.h>
#define IDI_48_EXTENT 8
#define MAX_NUM_IDI_48 max_num_isa_dev(IDI_48_EXTENT)
static unsigned int base[MAX_NUM_IDI_48];
static unsigned int num_idi_48;
module_param_hw_array(base, uint, ioport, &num_idi_48, 0);
MODULE_PARM_DESC(base, "ACCES 104-IDI-48 base addresses" );
static unsigned int irq[MAX_NUM_IDI_48];
static unsigned int num_irq;
module_param_hw_array(irq, uint, irq, &num_irq, 0);
MODULE_PARM_DESC(irq, "ACCES 104-IDI-48 interrupt line numbers" );
#define IDI48_IRQ_STATUS 0x7
#define IDI48_IRQ_ENABLE IDI48_IRQ_STATUS
static int idi_48_reg_mask_xlate(struct gpio_regmap *gpio, unsigned int base,
unsigned int offset, unsigned int *reg,
unsigned int *mask)
{
const unsigned int line = offset % 8;
const unsigned int stride = offset / 8;
const unsigned int port = (stride / 3) * 4;
const unsigned int port_stride = stride % 3;
*reg = base + port + port_stride;
*mask = BIT(line);
return 0;
}
static const struct regmap_range idi_48_wr_ranges[] = {
regmap_reg_range(0x0, 0x6),
};
static const struct regmap_range idi_48_rd_ranges[] = {
regmap_reg_range(0x0, 0x2), regmap_reg_range(0x4, 0x7),
};
static const struct regmap_range idi_48_precious_ranges[] = {
regmap_reg_range(0x7, 0x7),
};
static const struct regmap_access_table idi_48_wr_table = {
.no_ranges = idi_48_wr_ranges,
.n_no_ranges = ARRAY_SIZE(idi_48_wr_ranges),
};
static const struct regmap_access_table idi_48_rd_table = {
.yes_ranges = idi_48_rd_ranges,
.n_yes_ranges = ARRAY_SIZE(idi_48_rd_ranges),
};
static const struct regmap_access_table idi_48_precious_table = {
.yes_ranges = idi_48_precious_ranges,
.n_yes_ranges = ARRAY_SIZE(idi_48_precious_ranges),
};
static const struct regmap_config idi48_regmap_config = {
.reg_bits = 8,
.reg_stride = 1,
.val_bits = 8,
.io_port = true ,
.max_register = 0x6,
.wr_table = &idi_48_wr_table,
.rd_table = &idi_48_rd_table,
.precious_table = &idi_48_precious_table,
.use_raw_spinlock = true ,
};
#define IDI48_NGPIO 48
#define IDI48_REGMAP_IRQ(_id) \
[_id] = { \
.mask = BIT((_id) / 8), \
.type = { .types_supported = IRQ_TYPE_EDGE_BOTH }, \
}
static const struct regmap_irq idi48_regmap_irqs[IDI48_NGPIO] = {
IDI48_REGMAP_IRQ(0), IDI48_REGMAP_IRQ(1), IDI48_REGMAP_IRQ(2), /* 0-2 */
IDI48_REGMAP_IRQ(3), IDI48_REGMAP_IRQ(4), IDI48_REGMAP_IRQ(5), /* 3-5 */
IDI48_REGMAP_IRQ(6), IDI48_REGMAP_IRQ(7), IDI48_REGMAP_IRQ(8), /* 6-8 */
IDI48_REGMAP_IRQ(9), IDI48_REGMAP_IRQ(10), IDI48_REGMAP_IRQ(11), /* 9-11 */
IDI48_REGMAP_IRQ(12), IDI48_REGMAP_IRQ(13), IDI48_REGMAP_IRQ(14), /* 12-14 */
IDI48_REGMAP_IRQ(15), IDI48_REGMAP_IRQ(16), IDI48_REGMAP_IRQ(17), /* 15-17 */
IDI48_REGMAP_IRQ(18), IDI48_REGMAP_IRQ(19), IDI48_REGMAP_IRQ(20), /* 18-20 */
IDI48_REGMAP_IRQ(21), IDI48_REGMAP_IRQ(22), IDI48_REGMAP_IRQ(23), /* 21-23 */
IDI48_REGMAP_IRQ(24), IDI48_REGMAP_IRQ(25), IDI48_REGMAP_IRQ(26), /* 24-26 */
IDI48_REGMAP_IRQ(27), IDI48_REGMAP_IRQ(28), IDI48_REGMAP_IRQ(29), /* 27-29 */
IDI48_REGMAP_IRQ(30), IDI48_REGMAP_IRQ(31), IDI48_REGMAP_IRQ(32), /* 30-32 */
IDI48_REGMAP_IRQ(33), IDI48_REGMAP_IRQ(34), IDI48_REGMAP_IRQ(35), /* 33-35 */
IDI48_REGMAP_IRQ(36), IDI48_REGMAP_IRQ(37), IDI48_REGMAP_IRQ(38), /* 36-38 */
IDI48_REGMAP_IRQ(39), IDI48_REGMAP_IRQ(40), IDI48_REGMAP_IRQ(41), /* 39-41 */
IDI48_REGMAP_IRQ(42), IDI48_REGMAP_IRQ(43), IDI48_REGMAP_IRQ(44), /* 42-44 */
IDI48_REGMAP_IRQ(45), IDI48_REGMAP_IRQ(46), IDI48_REGMAP_IRQ(47), /* 45-47 */
};
static const char *idi48_names[IDI48_NGPIO] = {
"Bit 0 A" , "Bit 1 A" , "Bit 2 A" , "Bit 3 A" , "Bit 4 A" , "Bit 5 A" ,
"Bit 6 A" , "Bit 7 A" , "Bit 8 A" , "Bit 9 A" , "Bit 10 A" , "Bit 11 A" ,
"Bit 12 A" , "Bit 13 A" , "Bit 14 A" , "Bit 15 A" , "Bit 16 A" , "Bit 17 A" ,
"Bit 18 A" , "Bit 19 A" , "Bit 20 A" , "Bit 21 A" , "Bit 22 A" , "Bit 23 A" ,
"Bit 0 B" , "Bit 1 B" , "Bit 2 B" , "Bit 3 B" , "Bit 4 B" , "Bit 5 B" ,
"Bit 6 B" , "Bit 7 B" , "Bit 8 B" , "Bit 9 B" , "Bit 10 B" , "Bit 11 B" ,
"Bit 12 B" , "Bit 13 B" , "Bit 14 B" , "Bit 15 B" , "Bit 16 B" , "Bit 17 B" ,
"Bit 18 B" , "Bit 19 B" , "Bit 20 B" , "Bit 21 B" , "Bit 22 B" , "Bit 23 B"
};
static int idi_48_probe(struct device *dev, unsigned int id)
{
const char *const name = dev_name(dev);
struct gpio_regmap_config config = {};
void __iomem *regs;
struct regmap *map;
struct regmap_irq_chip *chip;
struct regmap_irq_chip_data *chip_data;
int err;
if (!devm_request_region(dev, base[id], IDI_48_EXTENT, name)) {
dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n" ,
base[id], base[id] + IDI_48_EXTENT);
return -EBUSY;
}
regs = devm_ioport_map(dev, base[id], IDI_48_EXTENT);
if (!regs)
return -ENOMEM;
map = devm_regmap_init_mmio(dev, regs, &idi48_regmap_config);
if (IS_ERR(map))
return dev_err_probe(dev, PTR_ERR(map),
"Unable to initialize register map\n" );
chip = devm_kzalloc(dev, sizeof (*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
chip->name = name;
chip->status_base = IDI48_IRQ_STATUS;
chip->unmask_base = IDI48_IRQ_ENABLE;
chip->clear_on_unmask = true ;
chip->num_regs = 1;
chip->irqs = idi48_regmap_irqs;
chip->num_irqs = ARRAY_SIZE(idi48_regmap_irqs);
err = devm_regmap_add_irq_chip(dev, map, irq[id], IRQF_SHARED, 0, chip,
&chip_data);
if (err)
return dev_err_probe(dev, err, "IRQ registration failed\n" );
config.parent = dev;
config.regmap = map;
config.ngpio = IDI48_NGPIO;
config.names = idi48_names;
config.reg_dat_base = GPIO_REGMAP_ADDR(0x0);
config.ngpio_per_reg = 8;
config.reg_mask_xlate = idi_48_reg_mask_xlate;
config.irq_domain = regmap_irq_get_domain(chip_data);
return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(dev, &config));
}
static struct isa_driver idi_48_driver = {
.probe = idi_48_probe,
.driver = {
.name = "104-idi-48"
},
};
module_isa_driver_with_irq(idi_48_driver, num_idi_48, num_irq);
MODULE_AUTHOR("William Breathitt Gray " );
MODULE_DESCRIPTION("ACCES 104-IDI-48 GPIO driver" );
MODULE_LICENSE("GPL v2" );
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